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LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF AMOUNT OF REVENUE AND INTEREST, TRADITIONAL AND LIMITED PAYMENT CONTRACTS (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | $ 1,272.9 | $ 1,225.6
Interest accretion | 243.9 | 241.7
Other annuities |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 4.3 | 3.3
Interest accretion | 6.3 | 6.5
Supplemental health |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 379.1 | 369.2
Interest accretion | 85.9 | 84.6
Medicare supplement |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 338.0 | 310.8
Interest accretion | 4.9 | 5.1
Long-term care |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 182.0 | 175.2
Interest accretion | 87.5 | 87.6
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 369.5 | 367.1
Interest accretion | $ 59.3 | $ 57.9

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